Receiver extension tube for a firearm



FIG. 1 shows an isometric view of a receiver extension tube for a firearm.

FIG. 2 shows a bottom plan view of a receiver extension tube for a firearm.

FIG. 3 shows a top plan view of a receiver extension tube for a firearm.

FIG. 4 shows a rear plan view of a receiver extension tube for a firearm.

FIG. 5 shows a front plan view of a receiver extension tube for a firearm.

FIG. 6 shows a left side plan view of a receiver extension tube for a firearm; and,

FIG. 7 shows a right side plan view of a receiver extension tube for a firearm. 

CLAIM What is claimed is the ornamental design for a receiver extension tube for a firearm, as shown. 